I'm sure it's fistfuls of fun riding a fixie in the snow, but you still have to lube the chain, right? Because that's about the extent of the maintenance I do on my geared winter bike.
And, really, is a minute or two spinning a barrel adjuster every month or so really that difficult? Not to turn this into a flame war, but I've often thought this "way easier to maintain" thing is kinda a load of crap.
But fixies are a blast to ride.